No cooling
Condenser fans, compressors, controls, coils, and electrical components may need review.
Commercial RTU Service
Rooftop Unit Repair in Mississauga and the GTA
Rooftop unit problems affect tenants, staff, customers, and equipment. OLU HVAC handles commercial RTU diagnostics for heating, cooling, airflow, controls, filters, belts, drains, and shutdowns.
Commercial propertiesOffices, retail units, plazas, clinics, warehouses, and light industrial spaces.
RTU diagnosticsNo heat, no cooling, airflow, belt, filter, drain, electrical, and control concerns.
24-hour lineCall any time for active commercial downtime.
RTU Problems
Rooftop unit repair for commercial buildings.
The first goal is to identify whether the problem is equipment, airflow, maintenance, controls, or access-related.
No heat
Heating sections, ignition, safeties, gas, airflow, and controls can all stop operation.
Weak airflow
Filters, belts, blower issues, dampers, and duct restrictions can affect occupied spaces.
Control issues
Schedules, sensors, thermostats, and economizer settings can look like equipment failure.
Commercial Coordination
Information that makes the visit faster.
Rooftop unit repair often depends on roof access, tenant coordination, and clear site contact details.
Access
Roof hatch, ladder, keys, and security instructions should be ready.
Affected area
Tell the technician which tenant, zone, or floor is affected.
Unit location
Unit numbers, labels, or roof photos can reduce diagnostic time.
Approval path
Property manager or owner approvals should be clear before quoted work starts.
Inspection Focus
What OLU HVAC checks before recommending work.
Urgent HVAC calls still need a proper diagnostic path. These are the items that keep the visit practical.
- Site access, unit location, and affected tenant or zone.
- Thermostat, controls, schedule, and call for heat or cooling.
- Filters, belts, blower, coil, drain, and airflow.
- Electrical components, safeties, fans, and heating/cooling operation.
- Maintenance, repair, or replacement recommendation.
Process
How the service call moves forward.
The goal is to move from urgent symptom to clear next step without wasting time.
Collect site details
Address, access, unit location, and urgency are confirmed first.
Inspect the RTU
The technician checks the unit, controls, airflow, and operating condition.
Explain options
Repair, maintenance, or replacement concerns are documented for approval.
Coordinate follow-up
Follow-up can be coordinated with owners, managers, tenants, or site contacts.
Request Service
Send the details and OLU HVAC will follow up.
For urgent no cooling, no heat, or active commercial downtime, call (437) 999-4242. For quotes and non-emergency requests, the form gives the team the right context before calling back.
- Open 24 hours for urgent HVAC calls.
- Based in Mississauga and serving the GTA.
- Clear next steps before repair or replacement work begins.
Request a Callback
Share the basics. The form posts through Netlify Forms.
Recent Work
Real HVAC work from OLU project photos
These photos show actual heating, cooling, water-heater, and commercial HVAC work handled by OLU HVAC in Mississauga and the GTA.
FAQ
Common Questions
Real answers to questions Mississauga and GTA customers ask us most.
Do you repair commercial rooftop HVAC units?
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Yes. OLU HVAC services rooftop heating and cooling units for offices, retail units, plazas, warehouses, clinics, and small commercial buildings.
What rooftop unit problems do you diagnose?
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Common calls include no cooling, no heat, weak airflow, short cycling, belt issues, dirty filters, drain problems, control faults, and electrical component failures.
Can you work with property managers and tenants?
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Yes. We can coordinate access, unit location, tenant impact, quotes, and follow-up with owners, managers, or site contacts.
Do rooftop units need preventive maintenance?
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Yes. Filters, belts, coils, drains, electrical checks, and seasonal operation checks help reduce surprise downtime.
Do you provide emergency RTU service?
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Yes. Call (437) 999-4242 for urgent commercial rooftop unit problems. Olu HVAC Mississauga is open 24 hours.
More Help
Related HVAC Services
Useful next pages for comparing repair, replacement, maintenance, emergency service, and nearby coverage.
Need urgent HVAC help in Mississauga or the GTA?
Call for active no heat, no cooling, or commercial downtime. Use the form for callback requests.